Now about the “terrible and forbidden books” — I am forced to say that most of them are purely imaginary. There never was any Abdul Alhazred or Necronomicon, for I invented these names myself. Robert Bloch devised the idea of Ludvig Prinn and his De Vermis Mysteriis, while the Book of Eibon is an invention of Clark Ashton Smith's. Robert E. Howard is responsible for Friedrich von Junzt and his Unaussprechlichen Kulten.... As for seriously-written books on dark, occult, and supernatural themes — in all truth they don’t amount to much. That is why it’s more fun to invent mythical works like the Necronomicon and Book of Eibon. - Lovecraft